Add project files.

ModVersionChecker/utils/TimeUtils.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ModVersionChecker.utils
+{
+    public class TimeUtils
+    {
+        public static long GetUnixTimeMillis(DateTime? dateTime)
+        {
+            DateTime dt = dateTime ?? DateTime.UtcNow;
+            return (long)(dt - new DateTime(1970, 1, 1)).TotalMilliseconds;
+        }
+
+        public static DateTime FromUnixTimeMillis(long unixTimeMillis)
+        {
+            return new DateTime(1970, 1, 1).AddMilliseconds(unixTimeMillis);
+        }
+
+        public static string ToFriendlyTime(long millisecods)
+        {
+            DateTime dateTime = FromUnixTimeMillis(millisecods);
+            return ToFriendlyTime(dateTime);
+        }
+
+        public static string ToFriendlyTime(DateTime dateTime)
+        {
+            // Use UTC for consistency with LiteDB if needed
+            DateTime now = DateTime.UtcNow;
+            
+
+            TimeSpan span = now - dateTime;
+
+            // Handle future dates (optional)
+            if (span.TotalSeconds < 0)
+                return "In the future";
+
+            if (span.TotalSeconds < 60)
+                return $"{(int)span.TotalSeconds} seconds ago";
+            if (span.TotalMinutes < 60)
+                return $"{(int)span.TotalMinutes} minute{(span.TotalMinutes < 2 ? "" : "s")} ago";
+            if (span.TotalHours < 24)
+                return $"{(int)span.TotalHours} hour{(span.TotalHours < 2 ? "" : "s")} ago";
+            if (span.TotalDays < 30)
+                return $"{(int)span.TotalDays} day{(span.TotalDays < 2 ? "" : "s")} ago";
+            if (span.TotalDays < 365)
+                return $"{(int)(span.TotalDays / 30)} month{(span.TotalDays / 30 < 2 ? "" : "s")} ago";
+
+            return $"{(int)(span.TotalDays / 365)} year{(span.TotalDays / 365 < 2 ? "" : "s")} ago";
+        }
+    }
+}